Connected: An Internet Encyclopedia
RFC 1877 - 1.3. Secondary DNS Server Address

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### 1.3. Secondary DNS Server Address

Description

  This Configuration Option defines a method for negotiating with the remote peer the address of the secondary DNS server to be used on the local end of the link. If local peer requests an invalid server address (which it will typically do intentionally) the remote peer specifies the address by NAKing this option, and returning the IP address of a valid DNS server.

  By default, no secondary DNS address is provided.

A summary of the Secondary DNS Address Configuration Option format is shown below. The fields are transmitted from left to right.

        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |     Type      |    Length     |      Secondary-DNS-Address
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
          Secondary-DNS-Address (cont) |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Type

  131

Length

  6

Secondary-DNS-Address

  The four octet Secondary-DNS-Address is the address of the primary NBNS server to be used by the local peer. If all four octets are set to zero, it indicates an explicit request that the peer provide the address information in a Config-Nak packet.

Default

  No address is provided.

Next: 1.4. Secondary NBNS Server Address

Connected: An Internet Encyclopedia
RFC 1877 - 1.3. Secondary DNS Server Address